Page 221 - Principles of Applied Reservoir Simulation 2E

206 Principles of Applied Reservoir Simulation

Table 20-7c
Corrected Oil-Phase Properties
Pressure Oil FVF Oil Rso
(psia) (RB/STB) (SCF/STB)
3014.7 1.426 521
4014.7 1.472 586
5014.7 1.490 622
6014.7 1.500 650

20.5.2 Undersaturated Oil Properties
Slopes for undersaturated oil properties are calculated from Table 20-
The slopes are discussed in Chapter 24.6.
Table 20-8
Undersaturated Oil Properties
Pressure Corrected B opb Ho
(psia) (RB/STB) (cp) Remarks
2515 1.3800 0.641 Bubble Point

3935 1.3473 0.706 Undersaturated Values

The rate of change of oil FVF with respect to pressure for the under-
saturated oil is approximated by the difference

A B 0 1.3473-1.3800 n _ RB/STB
« - U.
A/> 3935-2515 psia

This linear approximation is reasonable in many cases. Nonlinear, undersaturated
slopes can be modeled by some simulators.
Similarly, the rate of change of oil viscosity with respect to pressure for
the undersaturated oil is

A 0.706-0.641
AP 3935-2515 psia
The rate of change of solution GOR (R so) is zero in the pressure regime above
the bubble point pressure.